2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
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21 * may be used to endorse or promote products derived from this software
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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36 * @(#)stdio.h 8.5 (Berkeley) 4/29/95
37 * $Id: stdio.h,v 1.13 1997/04/13 15:50:07 bde Exp $
43 #include <sys/cdefs.h>
44 #include <machine/ansi.h>
47 typedef _BSD_SIZE_T_ size_t;
56 * This is fairly grotesque, but pure ANSI code must not inspect the
57 * innards of an fpos_t anyway. The library internally uses off_t,
58 * which we assume is exactly as big as eight chars. (When we switch
59 * to gcc 2.4 we will use __attribute__ here.)
61 * WARNING: the alignment constraints on an off_t and the struct below
62 * differ on (e.g.) the SPARC. Hence, the placement of an fpos_t object
63 * in a structure will change if fpos_t's are not aligned on 8-byte
64 * boundaries. THIS IS A CROCK, but for now there is no way around it.
66 #if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__)
67 typedef _BSD_OFF_T_ fpos_t;
69 typedef struct __sfpos {
74 #define _FSTDIO /* Define for new stdio with functions. */
77 * NB: to fit things in six character monocase externals, the stdio
78 * code uses the prefix `__s' for stdio objects, typically followed
79 * by a three-character attempt at a mnemonic.
89 * stdio state variables.
91 * The following always hold:
93 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
94 * _lbfsize is -_bf._size, else _lbfsize is 0
95 * if _flags&__SRD, _w is 0
96 * if _flags&__SWR, _r is 0
98 * This ensures that the getc and putc macros (or inline functions) never
99 * try to write or read from a file that is in `read' or `write' mode.
100 * (Moreover, they can, and do, automatically switch from read mode to
101 * write mode, and back, on "r+" and "w+" files.)
103 * _lbfsize is used only to make the inline line-buffered output stream
104 * code as compact as possible.
106 * _ub, _up, and _ur are used when ungetc() pushes back more characters
107 * than fit in the current _bf, or when ungetc() pushes back a character
108 * that does not match the previous one in _bf. When this happens,
109 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
110 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
112 * NB: see WARNING above before changing the layout of this structure!
114 typedef struct __sFILE {
115 unsigned char *_p; /* current position in (some) buffer */
116 int _r; /* read space left for getc() */
117 int _w; /* write space left for putc() */
118 short _flags; /* flags, below; this FILE is free if 0 */
119 short _file; /* fileno, if Unix descriptor, else -1 */
120 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
121 int _lbfsize; /* 0 or -_bf._size, for inline putc */
124 void *_cookie; /* cookie passed to io functions */
125 int (*_close) __P((void *));
126 int (*_read) __P((void *, char *, int));
127 fpos_t (*_seek) __P((void *, fpos_t, int));
128 int (*_write) __P((void *, const char *, int));
130 /* separate buffer for long sequences of ungetc() */
131 struct __sbuf _ub; /* ungetc buffer */
132 unsigned char *_up; /* saved _p when _p is doing ungetc data */
133 int _ur; /* saved _r when _r is counting ungetc data */
135 /* tricks to meet minimum requirements even when malloc() fails */
136 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
137 unsigned char _nbuf[1]; /* guarantee a getc() buffer */
139 /* separate buffer for fgetln() when line crosses buffer boundary */
140 struct __sbuf _lb; /* buffer for fgetln() */
142 /* Unix stdio files get aligned to block boundaries on fseek() */
143 int _blksize; /* stat.st_blksize (may be != _bf._size) */
144 fpos_t _offset; /* current lseek offset (see WARNING) */
151 #define __SLBF 0x0001 /* line buffered */
152 #define __SNBF 0x0002 /* unbuffered */
153 #define __SRD 0x0004 /* OK to read */
154 #define __SWR 0x0008 /* OK to write */
155 /* RD and WR are never simultaneously asserted */
156 #define __SRW 0x0010 /* open for reading & writing */
157 #define __SEOF 0x0020 /* found EOF */
158 #define __SERR 0x0040 /* found error */
159 #define __SMBF 0x0080 /* _buf is from malloc */
160 #define __SAPP 0x0100 /* fdopen()ed in append mode */
161 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
162 #define __SOPT 0x0400 /* do fseek() optimization */
163 #define __SNPT 0x0800 /* do not do fseek() optimization */
164 #define __SOFF 0x1000 /* set iff _offset is in fact correct */
165 #define __SMOD 0x2000 /* true => fgetln modified _p text */
168 * The following three definitions are for ANSI C, which took them
169 * from System V, which brilliantly took internal interface macros and
170 * made them official arguments to setvbuf(), without renaming them.
171 * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
173 * Although numbered as their counterparts above, the implementation
174 * does not rely on this.
176 #define _IOFBF 0 /* setvbuf should set fully buffered */
177 #define _IOLBF 1 /* setvbuf should set line buffered */
178 #define _IONBF 2 /* setvbuf should set unbuffered */
180 #define BUFSIZ 1024 /* size of buffer used by setbuf */
184 * FOPEN_MAX is a minimum maximum, and is the number of streams that
185 * stdio can provide without attempting to allocate further resources
186 * (which could fail). Do not use this for anything.
188 /* must be == _POSIX_STREAM_MAX <limits.h> */
189 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
190 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
192 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
194 #define P_tmpdir "/var/tmp/"
196 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */
197 #define TMP_MAX 308915776
200 #define SEEK_SET 0 /* set file offset to offset */
203 #define SEEK_CUR 1 /* set file offset to current plus offset */
206 #define SEEK_END 2 /* set file offset to EOF plus offset */
209 #define stdin (&__sF[0])
210 #define stdout (&__sF[1])
211 #define stderr (&__sF[2])
214 * Functions defined in ANSI C standard.
217 void clearerr __P((FILE *));
218 int fclose __P((FILE *));
219 int feof __P((FILE *));
220 int ferror __P((FILE *));
221 int fflush __P((FILE *));
222 int fgetc __P((FILE *));
223 int fgetpos __P((FILE *, fpos_t *));
224 char *fgets __P((char *, int, FILE *));
225 FILE *fopen __P((const char *, const char *));
226 int fprintf __P((FILE *, const char *, ...));
227 int fputc __P((int, FILE *));
228 int fputs __P((const char *, FILE *));
229 size_t fread __P((void *, size_t, size_t, FILE *));
230 FILE *freopen __P((const char *, const char *, FILE *));
231 int fscanf __P((FILE *, const char *, ...));
232 int fseek __P((FILE *, long, int));
233 int fsetpos __P((FILE *, const fpos_t *));
234 long ftell __P((FILE *));
235 size_t fwrite __P((const void *, size_t, size_t, FILE *));
236 int getc __P((FILE *));
237 int getchar __P((void));
238 char *gets __P((char *));
239 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
240 extern __const int sys_nerr; /* perror(3) external variables */
241 extern __const char *__const sys_errlist[];
243 void perror __P((const char *));
244 int printf __P((const char *, ...));
245 int putc __P((int, FILE *));
246 int putchar __P((int));
247 int puts __P((const char *));
248 int remove __P((const char *));
249 int rename __P((const char *, const char *));
250 void rewind __P((FILE *));
251 int scanf __P((const char *, ...));
252 void setbuf __P((FILE *, char *));
253 int setvbuf __P((FILE *, char *, int, size_t));
254 int sprintf __P((char *, const char *, ...));
255 int sscanf __P((const char *, const char *, ...));
256 FILE *tmpfile __P((void));
257 char *tmpnam __P((char *));
258 int ungetc __P((int, FILE *));
259 int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
260 int vprintf __P((const char *, _BSD_VA_LIST_));
261 int vsprintf __P((char *, const char *, _BSD_VA_LIST_));
265 * Functions defined in POSIX 1003.1.
268 /* size for cuserid(3); UT_NAMESIZE + 1, see <utmp.h> */
271 #define L_ctermid 1024 /* size for ctermid(3); PATH_MAX */
274 char *ctermid __P((char *));
275 FILE *fdopen __P((int, const char *));
276 int fileno __P((FILE *));
278 #endif /* not ANSI */
281 * Portability hacks. See <sys/types.h>.
283 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
285 #ifndef _FTRUNCATE_DECLARED
286 #define _FTRUNCATE_DECLARED
287 int ftruncate __P((int, _BSD_OFF_T_));
289 #ifndef _LSEEK_DECLARED
290 #define _LSEEK_DECLARED
291 _BSD_OFF_T_ lseek __P((int, _BSD_OFF_T_, int));
293 #ifndef _MMAP_DECLARED
294 #define _MMAP_DECLARED
295 char *mmap __P((void *, size_t, int, int, int, _BSD_OFF_T_));
297 #ifndef _TRUNCATE_DECLARED
298 #define _TRUNCATE_DECLARED
299 int truncate __P((const char *, _BSD_OFF_T_));
302 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
305 * Routines that are purely local.
307 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
309 int asprintf __P((char **, const char *, ...));
310 char *fgetln __P((FILE *, size_t *));
311 int fpurge __P((FILE *));
312 int getw __P((FILE *));
313 int pclose __P((FILE *));
314 FILE *popen __P((const char *, const char *));
315 int putw __P((int, FILE *));
316 void setbuffer __P((FILE *, char *, int));
317 int setlinebuf __P((FILE *));
318 char *tempnam __P((const char *, const char *));
319 int snprintf __P((char *, size_t, const char *, ...));
320 int vasprintf __P((char **, const char *, _BSD_VA_LIST_));
321 int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_));
322 int vscanf __P((const char *, _BSD_VA_LIST_));
323 int vsscanf __P((const char *, const char *, _BSD_VA_LIST_));
327 * This is a #define because the function is used internally and
328 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide
329 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
331 #define vfscanf __svfscanf
334 * Stdio function-access interface.
337 FILE *funopen __P((const void *,
338 int (*)(void *, char *, int),
339 int (*)(void *, const char *, int),
340 fpos_t (*)(void *, fpos_t, int),
343 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
344 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
345 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
348 * Functions internal to the implementation.
351 int __srget __P((FILE *));
352 int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
353 int __swbuf __P((int, FILE *));
357 * The __sfoo macros are here so that we can
358 * define function versions in the C library.
360 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
361 #if defined(__GNUC__) && defined(__STDC__)
362 static __inline int __sputc(int _c, FILE *_p) {
363 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
364 return (*_p->_p++ = _c);
366 return (__swbuf(_c, _p));
370 * This has been tuned to generate reasonable code on the vax using pcc.
372 #define __sputc(c, p) \
374 (p)->_w >= (p)->_lbfsize ? \
375 (*(p)->_p = (c)), *(p)->_p != '\n' ? \
378 __swbuf((int)(c), p) : \
379 (*(p)->_p = (c), (int)*(p)->_p++))
382 #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
383 #define __sferror(p) (((p)->_flags & __SERR) != 0)
384 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
385 #define __sfileno(p) ((p)->_file)
387 #define feof(p) __sfeof(p)
388 #define ferror(p) __sferror(p)
389 #define clearerr(p) __sclearerr(p)
392 #define fileno(p) __sfileno(p)
396 #define getc(fp) __sgetc(fp)
397 #define putc(x, fp) __sputc(x, fp)
400 #define getchar() getc(stdin)
401 #define putchar(x) putc(x, stdout)
403 #endif /* !_STDIO_H_ */